Periodic table answers

2. Periodicity describes the repeating pattern of physical and chemical properties that can be seen when the elements are arranged according to their atomic number.3. None of the noble gases (He – Rn), which make up the eighth group, had been discovered when Mendeleev first produced his periodic table in 1869. More recently the number pf groups has been increased from 8 to 18 as the transition metals have their own...

To access the entire contents of this site, you need to log in or subscribe to it..

Click the free stuff button on the home page to access free pages or check the blog (which is also free).

All materials on this website are for the exclusive use of teachers and students at subscribing schools for the period of their subscription. Any unauthorised copying or posting of materials on other websites is an infringement of our copyright and could result in your account being blocked and legal action being taken against you.